For High-Density Power Scenarios
SF₆ Gas-Insulated Switchgear (GIS) is a key medium- and high-voltage solution from Kechang Electrical.Designed for high reliability, compact layout and strong insulation, it fully complies with IEC, GB and State Grid standards. Using SF₆ as the main insulation and arc-quenching medium, this switchgear is ideal for urban substations, industrial parks and critical infrastructure - especially where space is limited and stable performance is essential.
SF6 Gas Tightness Maintenance
The reliability of any SF₆ GIS depends heavily on the integrity of its sealed compartments. Kechang's design employs a precision-welded enclosure and advanced gas-tight sealing techniques. Every gas chamber undergoes strict leak-testing using helium mass spectrometry to ensure extremely low leakage levels (≤0.1% per year). Maintaining stable SF₆ density over long periods ensures consistent insulation strength and arc suppression, even under complex electrical conditions. The sealed housing also blocks moisture, dust, and corrosive outdoor gases, protecting internal components and extending equipment lifespan.
Compact Modular Integration
To solve the space constraints commonly found in urban substations and indoor power rooms, Kechang's SF₆ GIS features a compact and modular design.We integrate circuit breakers, isolating switches, earthing switches, and instrument transformers into one sealed tank.Compared with traditional air-insulated switchgear, our GIS can reduce the overall space by about 60% to 70%. The functional modules can be flexibly arranged based on actual project requirements, which simplifies installation and makes future expansion easy without major reconstruction.This compact structure is especially suitable for basement substations, high-rise buildings, and other places with limited installation space.
SF6 Gas Density Online Monitoring
We use an online SF₆ gas density monitoring system to further improve the safety of equipment operation.This system keeps real-time monitoring of the gas density and temperature inside each sealed chamber.It automatically corrects the data to standard conditions and will send out an alarm if the density is lower than the preset value. When an alarm is activated, the relevant operating parts will be locked automatically to avoid any unsafe operation.In addition, the system can record long-term changes in gas density, which helps users find potential faults in advance and make better maintenance plans.
Wide-Temperature Adaptability
This switchgear is designed to work reliably even in extreme weather conditions, with an operating temperature range from −30°C to +55°C.The outer enclosure is made of reinforced steel and treated with anti-corrosion and anti-aging materials for extra durability. With these designs, the SF₆ gas stays stable, and all mechanical parts work properly in high-altitude areas, low-temperature environments, or high-temperature industrial sites.
Low-Cost Maintenance Advantage
Because the stability of SF₆ gas and its sealed modular design, this switchgear requires virtually no maintenance. Internal components require no daily cleaning or insulation replacement; only periodic checks of mechanical operation and gas monitoring equipment are needed. A circuit breaker with a mechanical life exceeding 30,000 cycles further reduces maintenance frequency. These characteristics contribute to a significant reduction in long-term operating and maintenance costs for users.
How to pick SF6?
If you want to choose a suitable GIS equipment, you have to take many factors into account in a professional way. Technical parameters, working environment, environmental protection requirements and long-term operation cost are all very important. Here are some practical suggestions for you:
1. Electrical Parameters: You need to confirm the rated voltage, rated current, peak withstand current and short-circuit current. These parameters should match the actual working conditions of the power grid, so as to ensure the equipment can work safely and stably.
2. Insulation and Environmental Protection: SF6 gas has an impact on the environment. If your project has high requirements for environmental protection, you can think about other options, such as environmental-friendly gas insulated switchgear or solid insulated switchgear.
3. Structure and Installation Space: GIS has a compact structure and small occupation area. You should make clear whether it is used indoor or outdoor, and whether the space is enough. Choosing a modular type will bring convenience for later expansion.
4. Operation and Maintenance: You should pay attention to the sealing performance, gas leakage rate, mechanical life, intelligent monitoring function. Low maintenance or maintenance-free design is also a big advantage.
5. Standards and Certifications: It is necessary to check the manufacturer's qualifications, type test reports, whether it meets international standards, and whether the manufacturer has cooperation experience with famous international brands.
Product Specifications
| Project | Parameter | |||
| Load Switchgear (C) | Combined Elecctric Cabinet (F) | Circuit Breaker Cabinet(V) | ||
| Rated Voltage | 12kV | |||
| Rated Frequency | 50HZ | |||
| Rated Current | 630A | 1250A (Depends on Fuse Current) | 630A/1250A | |
| Rated Transfer Current | / | 1750A | / | |
| Cable Charging Break Current | 40A | 25A | ||
| No-load Transformer Breaking Current | 16A | 16A | ||
| Rated Switching Times of Active Load | 100 times | / | / | |
| Rated Number of Short Circuit Breakering | / | / | ≥30 times | |
| Rated Short-time Tolerable Current |
The Primary Loop | 20kA/4S | / | 20kA/4S,31.5kA/4S |
| Grounding Switch | 20kA/4S | / | 20kA/4S,31.5kA/4S | |
| Rated short circuit closing current |
The Primary Loop | 50kA | Limited by High Voltage Fuse | 50kA/80kA |
| Grounding Switch | 50kA | 50kA/80kA | ||
| 1 mimute Power Frequency Voltage Withstand |
Interphase with and against the ground | 42kV | ||
| Fracture | 48kV | |||
| Lighting Shock Withstand Voltage | Interphase with and against the ground | 75kV | ||
| Fracture | 85kV | |||
| Mechanical Life | The Main Switch | ≥5000 times | ≥10000 times | |
| Grounding Switch | ≥3000 times | |||
| Main Circuit Resistance | ≤120μΩ | ≤400μΩ | ≤200μΩ | |
| SF6 Gas Pressure Rating (20℃) | 0.035MPa | |||
| Annual Leakage Rate of SF6 Gas | 0.01% | |||
| Rated Power Supply Voltage of Secondary Loop | AC220V/DC110/DC48V/DC24V | |||
| 1 minute Power Frequency withstand Voltage of Secondary Loop | 2kV | |||
| Protection Grade | Aeration Tank | IP67 | ||
| Shell and Operating Mechanism | IP4X | |||
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